D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
9/62
D21H 3/02 (1980.01)
Patent
CA 1054758
ABSTRACT OF THE DISCLOSURE The present invention provides in the production of paper; cardboard or paper board from a resin containing pulp or a mechanical pulp a process for inhibiting the separation of resins from said pulp which comprises adding to said pulp an additive including at least one phosphonic acid having the general formula Image wherein R is H, -CH3, -NH2, -CH2OH, -(CH2)nCH3, -(CH2)nCOOH, Image or - (CH2)nPO3H2 Image R2 is H, -OH, -PO3H2, Image -(CH2)n-COOH, Image , Image H2O3PH2C- N-(CH2)n Image , Image or Image R3 is H, -OH, -NH2, -CH3 -(CH2)nCH3, -(CH2)nCOOH, -NH-(CH2)n-PO3H2, -NH?CH2COOH, Image and n is a number from 0 to 6 and an alkali salt thereof and at least one member selected from an orthophosphoric acid and a polyphosphoric acid or an alkali salt thereof, said additive being present in the pulp in an amount from 0.02 to 1.0% based on the weight of the dry pulp. The invention also provides an additive for use in said process which comprises (a) at least one phosphonic acid having the general formula given above and (b) at least one member selected from orthophosphonic acid and polyphosphoric acids and their alkali salts the weight ratio of (a) to (b) being in the range 1:10 to 10:1.
220562
Hoger Ernst
Scholl Margarete
LandOfFree
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